Means for preventing the formation of continuous voids in concrete masses



Patented Feb. 1, v1938 PATE MEANS FOR PBEVENTINGTHE FOBMATIO. OFCONTINUOUS VOIDS 1N CONCRETE Masses,...

Vlami's C. Schenk, New. York, N. Y., a'ssignor to i Richmond ScrewAnchor' N. Y., a corporation of New York Co., Inc., Brooklyn,

Application May z5, 1337, serial No. 114,623

Amm. .wire- 11) vThis invention` relates to ties for concrete forms andhas for its Vobject theY provision of means yby which/the. formation ofcontinuous voids or.

passages throug'hfwhich leakage may occur par- 5 --ticularly'inwaterproof concrete work is avoided. f Metal rods are used inconcretework forvar- Vlous purposes. Some rods are used as partsv ofanchorages 4for lag screws for supporting form o l I e spaced parallelrods I and 2 between the ends of Y which are secured the helixes 3 and Iwhich re- 10 boards and for attaching boards or timbers to the 'l0subsequently formed concrete structure, while other rods originallylused for holding form .ties t are permitted to remain in the concretestructure after the forms are dismantled. In each case,

the rods employed usually pass through thestructure from points at ornear the faces of the struc-s ture. It has been found that in pouringconcrete there is often a tendency for the concrete to fail to closelypack around these rods, particularly on aline co-extensive with the rodand directly in.-

back of or at one side of the rod,*so that as a lresultV there is oftena continuous void or passage formed, through the concrete structureandextending substantially co'extensively with the rod and through whichleakage may occur particularly .when water directed against the concretestructure is under pressure.

It is therefore desirable to prevent the formation of these continuousvoids or passages through the concrete adjacent the rods which extend 3otherethrough. I attain this desired result by the use of portions formeddirectly upon,.or by elements attached upon the rods, which elements areof greater diameter than the diameter of the rods and which accordinglyinterrupt or break up the 1 continuity ofuniform diameter of the rod'andform stops Vor abutments. Therefore any voids formed in back of or atone side of the rod (the position of such voids being determined by thedirection of flow of the concrete) will be interrupted or broken up tosuch an extent as to prevent the passage of water or leakage through theconcrete structure. .Y

In the accompanying drawing, wherein several Y embodiments of theinvention are shown,'Fig. 1

is a sectional view through a concrete structure,

-' showing a form tie or anchorage in place, and

provided with my improvement; Fig. 2 is a side elevation of a shortsection vof rod formed with a disk-like enlargement;v Fig. 3 is asimilar view l of a short section of rod provided with an integrallyformed disk-like enlargement; Fig. 4 is a sectional View through aconcrete structure showing a rod with several enlargements in positionand indicatingin exaggerated form how voids the, line sassi-rig.2,1ookmg in the direction of` the arrows; and Fig. 6 is a sectional viewon the vline 8 6 ofrFig. 2, looking inthe direction ofthe arrows. o -I v-In the structure .shown vin Flg. yl'a device is shown which is usedas aform ,tie prior to the l pouringof the concrete, andas a screw anchorjage thereafter. The same consistsfof a pair of,

ceive lag'screws for holding the form boards in l place, and after theconcrete structure has vbeen formed, receive lag screws for holdingtimbers onto the concrete structure. y

lat i0 in Fig. 4. The location of these voids is20` dependent upon thedirection of 'ow of the concrete while being poured. For example, asshown in Fig. 5, when the concrete flows in the direction of the arrow,voids such as shown at i0 will `belikeiy to form in the position therelindicated 25 in dotted lines at one side of the rod i. When the rodsextending through the concrete are of uniform diameter, there is apossibility that the voids will be in Icontinuous form extendingcoextensively with the rods and thus continuing 30 e.

for the entire length of the rod through the con- `crete. In waterproofconcrete structures, this tinuous passage through the concrete will `be40 l thereby avoided.

In the structures of Figs. 1, 2, 4,' and 6 the rods are provided withdisk-like members or washers 5 which are held rigidly in position on therods by the formation of integral shoulders 6 and E 45 on 'the' rodsbetween which the washers 5 are securely clamped. These shoulders 6 and1 are v vformed by distortion of the body of the rod while the washer ison the rod and theysecurely clamp [the washer in position thereon. Thewasher is 50 of substantial diameter and therefore provides surfacesextending radially of the rod, and these washersmay be placed on any onerod at such spaced apart intervals as may be desired. When severalparallel rods areused together, such las orsrce '1 therods Isnd2,thewasherslocstedononerod may be placed in staggered relationshipwith respectto those on the other rod, if desired.

When one or more washers is used on a rod, it will be clear, as seen inFig. 4, that any void formed at one side of the rod and following alongthe bodvof the rod will be stopped or interrupted by the washers. Theremay, of course, be a small void formed at one side of each washer asindicated at il in Fig. 4. but these voids l I will be disaligned fromthat shown at il. The disk-like members or washers l may be altered inshape or diameter to suit various requirements and may be secured on therod in any suitable manner. As a matter of fact, the same may be formedas an integral part of the rod if desired, as shown at 8 in Fig. 3.

As previously explained, the members i or I may be located on rods oi'any kind extending through a concrete structure, for the purpose ofLinterrupting the formation of .continuous voids through the structure.without regard to the uses or purposes of the rods used therein. Inother words, I do not limit my invention to the use of thesevoid-interrupting elements in combination ,icmiso with form tie rods orother. particular types of rods. as the same will function wherever alengthy rod or other element extends through a concrete structure andwhere the formation of a continuous void through the structure is to beavoided.

What ,I claim is:

A rod for incorporation in a concrete structure. having a body portionof substantially uniform diameter extending from one side of theconcrete structure to the other and provided with at least one disktightly positioned on it and extending radially of it whereby said diskwill be completely embedded in and surrounded by the concrete structureand will interrupt the formation of voids in concrete around the rod,whichl voids normally follow the body of the rod, and means for holdingsaid disk in position on the rod comprising an annular raised ribintegrally formed on the rod on each side of the disk whereby the diskis tightly gripped between said annular ribs and any space between thedisk and rod is sealed and leakagel between the disk and body of the rodis thereby prevented by said ribs.

T. C. SCHENK.

